public class Test {
    public static void main(String[] args) {
       MySingleList mySingleList=new MySingleList();
     mySingleList.addFirst(12);
     mySingleList.addFirst(23);
     mySingleList.addFirst(33);
     mySingleList.addFirst(45);
       mySingleList.display();
       System.out.println("==================");
        System.out.println(mySingleList.contains(12));
    }
}
